U3 will consistently hang on startup if there's any keystrokes in the first, oh, 1-2 seconds of the title screen appearing, requiring me to Force Quit. Still happens on v2.1. I've had this happen on two different MacBooks. I'm currently on a MBP running 10.6.7.

Any ideas? It's easy enough to work around, but annoying those few times I jump the gun on the spacebar.